Remove unused var #18

	name: Build Dockerfiles

	on:
	push:
	branches-ignore:
	- coverity_scan
	workflow_dispatch:

	env:
	CI: 1
	GH_ACTIONS: 1
	DEBIAN_FRONTEND: noninteractive
	APT_OPTS: "-y --no-install-recommends"

	jobs:
	#
	# Generate matrix based on docker directories.
	#
	gen-matrix:

	runs-on: ubuntu-latest

	outputs:
	matrix: ${{ steps.gen-matrix.outputs.matrix }}

	steps:

	- uses: actions/checkout@v4
	with:
	lfs: false

	- id: gen-matrix
	name: Generate matrix based on docker targets
	run: \|
	cd scripts/docker/build
	M=$(ls \| perl -n -e '{chomp; push @L,"\"$_\""} END{print "{\"env\":[{\"OS\":",join("},{\"OS\":",@L),"}]}"}')
	echo "Matrix: $M"
	echo matrix=$M >> $GITHUB_OUTPUT

	#
	# Run docker target for each given OS. This will build the
	# Docker image.
	#
	docker:
	needs:
	- gen-matrix

	runs-on: ubuntu-20.04

	strategy:
	fail-fast: false
	matrix: ${{ fromJson(needs.gen-matrix.outputs.matrix) }}

	env: ${{ matrix.env }}

	name: "v4.0.x-${{ matrix.env.OS }}"

	steps:

	- uses: actions/checkout@v4
	with:
	fetch-depth: 1

	- name: Regenerate Dockerfile
	run: \|
	rm scripts/docker/build/$OS/Dockerfile \|\| true
	make docker.$OS.regen

	- name: Build docker image
	run: \|
	make docker.$OS.build

	#
	# If the CI has failed and the branch is ci-debug then start a tmate
	# session. SSH rendezvous point is emited continuously in the job output.
	#
	- name: "Debug: Start tmate"
	uses: mxschmitt/action-tmate@v3
	with:
	limit-access-to-actor: true
	if: ${{ github.ref == 'refs/heads/ci-debug' && failure() }}

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